Perma Pure Mini-GASS 2812T - Manual (Page 15)

15 Mini-GASS User Manual
4.3 Temperature Control
PID Electronic Temperature Controller
1. Press and hold “ ” key (Refer to Figure 8).
2. Press either up or down key to adjust setpoint. Setpoint temperature will change
one
°C with each press of arrow key.
3. When desired temperature is reached, release both keys.
NOTE: MG-1228, 2812P, and 1235 systems have a low temperature alarm that is
programmed into controller. Default temperature setting for alarm is 5 O C below setpoint
temperature. Refer to enclosed CAL Controls temperature controller manual and for more
information.
Steam Temperature Control
Steam heated systems are regulated by a thermostatic steam control valve located in the
purge air exhaust stream. This valve is preset at the factory to an appropriate temperature
determined by sample conditions. A typical setpoint temperature is 180
O F which is the
approximate temperature of the purge air exhaust as indicated by analog thermometer
located in the purge air exhaust stream.
Safety Interlocks (SIVS2)
Systems equipped with the SIVS2 interlock option automatically shuts off the sample pump
or sample control valve in the event of low purge airflow or low temperature in the system. To
accomplish this, a differential pressure switch in the purge air inlet senses the flow of purge
air and energizes a relay. This relay then sends power to the contacts of a second relay,
which will energize only when the temperature set point has been reached. After energizing,
this second relay sends power to the sample valve and the valve will open and allow sample
flow. Under normal operating conditions both safety relays will remain energized (When the
system is operating normally, open contacts will close and remain closed). Alarm relays may
be field wired to initiate an external alarm.
Figure 8